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Jan. 12, 1932. P. B. REEVES Re. 18,333

VARIABLE SPEED UNIT Original Filed March 26, 1928 2 Sheets-Sheet 1 IN VENTOR.

Jan. 12, 1932. p REEVES Rel-18,333

VAR IABLE S FEED UNI T Original Filed March 26, 1928 2 Sheets-Sheet 2 1| nil Hm 0 Q INVENTOR.

Paul 13.1?661/65, y /wwafi/m ATTOR NEYJ Reiuued Jan. 12, 1932 UNITED STATES PATENT OFFICE PAUL B. REEVES, OF COLUMBUS, INDIANA, ASSIGNOB TO REEVES PULLEY COMPANY,

OF COLUMBUS, INDIANA, A CORPORATION OF INDIANA VARIABLE SPEED UNIT Original No. 1,822,985, dated September 15, 1931, Serial No. 264,819, filed larch 26,1928; Application for reissue filed October 16, 1931.

My invention relates to improvements in speed varying transmission, means and it is one of the objects of my invention to provide a simple and eflicient speed varying power transmission unit.

For the purpose of disclosing my invention I have illustrated certain embodiments thereof in the accompanying drawings in which- Fig. 1 is a plan view of a transmission embodylng my invention;

' Fig. 2 is a sideelvation thereof;

Fig. 3 is an end elevation showing the motor mounting;

Fig. 4 is a sectional view showing a modification;

Fig. '5 is a side elevation showing another modification of my invention, and

Fig. 6 is a side elevation partly in section showing still another modification of my invention.

In the embodiment illustrated the source of power is shown as an electric motor 1 which is slidably mounted on a suitable base 2. The

motor may be mounted on gibs or other suitable guide rails on the base 2 and is moved to its adjusted position by means of an adjusting screw 3 held against longitudinal movement by collars 4 and threaded through s an ear 5 on the motor. said screw being provided with squared ends 6. The motor shaft has mounted thereon a pair of cone discs 7 and 8, the disc 7 being rigidly mounted on the motor shaft and the disc 8 being splined thereon so that while it rotates with the shaft it may move relatively to the disc 7. The disc 8 is biased toward the disc 7 by means of a coiled compressing spring 9 interposed between the hub of the disc 8 and a collar 10 on the shaft, the collar being held in an adjusted position by means of a set nut 11 screwed on the threaded end of the-shaft. The driven element 12 is provided with an ordinary pulley 13 and the cone pair is connected with the pulley 13 by means of a belt or driving member 14 which may he V shape in cross section to provide side friction faces to engagethe cone faces of the discs 7 and 8. As indicated in the drawin s, having particular ref- 60 erence to Fig. 1, tlie pulley 13, which .S-is a- Serial No. 589,330.

flat faced pulley, is of such widthrelative to the width of the inner face of the belt 14 that this inner face of the belt is narrower than the pulley face by an amount at least equal to the lateral movement of the belt due to thea-xial adjustment of the cone 8. As a result the inner face of the belt will always ride on the fiat faced pulleyirrespective of the fact that the belt will have a certain lateral movement when it rides down the sides of the cones 7 and 8, a

The operation of the device is obvious. With the parts in the position illustrated in Fig. 1 the pulley 13 is being driven at its maximum speed with the belt engaging the cones at the highest point thereon. In order to decrease the speed of the pulley 13 the power motor I is moved in a direction to move the discs 7 and 8 away from the pulley 13. Due to this movement and to the fact that the belt is of a fixed length, as the discs 7 and 8 move away from the pulley 13 the belt will ride farther down toward the center of the cones, the disc 8 moving along the shaft to accommodate this shifting;

In Fig. 4 I have illustrated a modified form of structure wherein the disc 7 is fixed on the shaft of the motor 1. This disc is provided with an elongated hub 15 'on which is splined a disc 8a the disc being maintained in close rel ation'to the disc 7 by means of the coiled spring 9a the tension of which is adjusted by the nut 11a. I In Fig. 5 I have illustrated a modification wherein instead of varying the distancebetween the centers of the shafts for the discs and pulley to vary the efiective length of the drive belt, I provide a structure wherein the distance between the centers of the shafts is constant and the effective length of the belt is varied by means of an idler. In this structure an idle pulley 16' mounted'on one arm 17 of a bell crank lever pivoted as at 18'and having its otherarm 19 manipulated 95 by the adjusting screw 20. By operating the idler remove one side of the belt more closely adjacent to theopposite side,'and thus varying the effective length of the belt; t he same efiectj is produced I as in the structure illus- I09 trated in Fig. 1 wherein the distance between the pulley shafts in varied.

In Fig. 6 I have illustrated a structure wherein a flat belt 22 for driving the straight faced pulley 13 is rovided. As shown in this figure a driving 1t 21, V shaped in cross section, operates in connection with the, discs 7 and 8. A flat belt 22 rides over the outer surface of this comparatively short V shaped belt 21 and over the driven pulle 13. By this arrangement the V shaped be t makes the driving contact with the faces of the cone discs and transmits its power through the I engagement of the flat driving belt with the pulley 13.

I claim as my invention:

1. A s varying unit comprising a pair of paral el shafts, a pair of cones mounted on one of said shafts, one of said cones being fixed and the other movable relative thereto, means for biasing said movable cone toward the fixed cone, a straight faced pulley on the second shaft, a V-belt having an inner face narrower than the pulley face by an amount at least equal to the lateral movement of the belt resultin from cone adjustment for connecting sai cones with said pulley, and means by which the distance between said shafts may be varied while maintaining parallelism for varying the effective pulley dimeters.

2. A speed varying power transmission unit comprising a pair of parallel shafts, means b which said shafts may be laterally adjuste relative to one another while maintaining parallelism to vary their center distances, a pair, of cone discs mounted on one of said shafts, one of said discs being fixed thereto, a straight faced pulley on the oppomass ing parallelism, one of said shafts carrying a pair of cone discs one of said discs being fixed and the other being relatively movable axially with relation thereto, a straight faced pulley mounted on the other shaft, a justable means for biasingsaid cone discs toward one another, and a V-belt for connecting said discs and pulley, the inner face of said belt being narrower than the pulley face by an amount at least equalto the lateral movement of the belt resulting from cone adjustment. 5. A speed varymg power transmission unit comprisin a pair of cone shafts, one of said discs being fixed and the other disc being axially movable relative thereto, resilient means biasin said lastnamed disc toward. said fixed (1156, a driven straight-faced pulley mounted on the other shaft, a V-belt extending between said cone discs andsaid pulley, the inner face of said belt being narrower than the pulley face by a pair of parallel'shafts iscs mounted on one of said an amount at least equal to the lateral movement of the belt resultingfrom cone adjustment, and means b which the effective length 'of said belt relatlve to said shafts may be varied for causing the same to move inwardly and outwardly on saidcone discs.

Signed at Columbus, county of Bartholomew, State of Indiana, this 19th day of December, 1931.

PAUL B. REEVES.

and the other being movable axially relative fixed andthe other being axially movable relative tothe fixed disc, a straight-faced pul- 5 My mounted on the other shaft, a V-belt having a lower flat face operatively connecting discs and pulley, and means bias ng said cone discs toward one another, the lower face of said belt being narrower than the pulley face by an amount at least equal to the lateral movement of the belt resulting v l gga varying power ansmission unit comprising a air of arallel shafts, meansb which the istance tween. centers of said may be varied while maintainfrom cone 

